WO2016075787A1 - 半導体装置の製造方法及びガラス被膜形成装置 - Google Patents
半導体装置の製造方法及びガラス被膜形成装置 Download PDFInfo
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- WO2016075787A1 WO2016075787A1 PCT/JP2014/080041 JP2014080041W WO2016075787A1 WO 2016075787 A1 WO2016075787 A1 WO 2016075787A1 JP 2014080041 W JP2014080041 W JP 2014080041W WO 2016075787 A1 WO2016075787 A1 WO 2016075787A1
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- semiconductor device
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Definitions
- the present invention relates to a semiconductor device manufacturing method and a glass film forming apparatus.
- the conventional method for manufacturing a semiconductor device includes a “semiconductor wafer preparation step”, a “glass film formation step”, an “oxide film removal step”, a “roughened region formation step”, “ The "electrode forming step” and the “semiconductor wafer cutting step” are included in this order.
- a conventional method for manufacturing a semiconductor device will be described in the order of steps.
- a p + -type diffusion layer 912 is formed by diffusion of p-type impurities from one surface of an n ⁇ -type semiconductor wafer (n ⁇ -type silicon wafer) 910.
- An n + -type diffusion layer 914 is formed by n-type impurity diffusion to form a semiconductor wafer in which a pn junction parallel to the main surface is formed.
- oxide films 916 and 918 are formed on the surfaces of the p + type diffusion layer 912 and the n + type diffusion layer 914 by thermal oxidation (see FIG. 15A).
- a predetermined opening is formed in a predetermined portion of the oxide film 916 by a photoetching method.
- the semiconductor wafer is subsequently etched to form a groove 920 having a depth exceeding the pn junction from one surface of the semiconductor wafer (see FIG. 15B).
- the tank 10 storing the suspension 12 in which glass fine particles are suspended in a solvent is stored inside, the first electrode plate 14 connected to the negative terminal and the second electrode plate 16 connected to the positive terminal are placed facing each other while being immersed in the suspension 12, and the first electrode plate 14
- the glass film is formed by electrophoresis with the semiconductor wafer W disposed between the first electrode plate 16 and the second electrode plate 16 with the glass film formation planned surface (inner surface of the groove in FIG. 17) facing the first electrode plate 14 side.
- a glass coating 924 is formed on the planned surface.
- the glass fine particles for example, lead borosilicate glass mainly containing PbO, B 2 O 3 and SiO 2 is used.
- Electrode formation step Ni plating is performed on the semiconductor wafer to form the anode electrode 934 on the roughened region 932, and the cathode electrode 936 is formed on the other surface of the semiconductor wafer (FIG. 16C). )reference.).
- a highly reliable mesa semiconductor device can be manufactured by forming a glass coating 924 inside the groove 920 and then cutting the semiconductor wafer.
- the present invention has been made to solve the above-described problems, and is a case where a glass film forming process is performed using a semiconductor wafer having a base insulating film formed on a glass film forming scheduled surface as a semiconductor wafer.
- Another object of the present invention is to provide a method of manufacturing a semiconductor device and a glass film forming apparatus capable of manufacturing a highly reliable semiconductor device with high productivity.
- a method of manufacturing a semiconductor device includes a semiconductor wafer preparation step of preparing a semiconductor wafer having a base insulating film formed on a glass film formation scheduled surface, and a suspension in which glass fine particles are suspended in a solvent.
- the first electrode plate and the second electrode plate are placed facing each other in a state of being immersed in the suspension, and the first electrode plate and the second electrode plate are disposed between the first electrode plate and the second electrode plate.
- a ring electrode plate having an opening having a diameter smaller than the diameter of the semiconductor wafer is installed between the first electrode plate and the second electrode plate.
- the semiconductor wafer is disposed between the ring-shaped electrode plate and the second electrode plate, and the ring-shaped electrode plate is biased toward the potential side of the first electrode plate with respect to the potential of the second electrode plate.
- a glass film is formed on the surface on which the glass film is to be formed in a state where an electric potential is applied.
- a glass coating is formed on the glass coating formation planned surface in a state where the same potential as that of the first electrode plate is applied to the ring electrode plate.
- the glass coating is scheduled to be formed in a state where a potential between the potential of the first electrode plate and the potential of the second electrode plate is applied to the ring electrode plate. It is preferable to form a glass film on the surface.
- D2 is expressed as “D1 ( mm) ⁇ 50 mm ⁇ D2 (mm) ⁇ D1 (mm) ⁇ 1 mm ”.
- the ring-shaped electrode plate has an outer shape that encloses a virtual circle having a diameter D3 (mm) that satisfies a relationship of “D1 (mm) ⁇ D3 (mm)”. It is preferable to have.
- the semiconductor wafer preparation step includes a step of preparing a semiconductor wafer having a pn junction parallel to a main surface, and the pn junction from one surface of the semiconductor wafer. Forming the pn junction exposed portion on the inner surface of the groove by forming a groove having a depth exceeding, and forming the base insulating film on the inner surface of the groove so as to cover the pn junction exposed portion; It is preferable to contain.
- the semiconductor wafer preparation step includes a step of forming the pn junction exposed portion on the surface of the semiconductor wafer, and a step of forming the pn junction exposed portion of the semiconductor wafer so as to cover the pn junction exposed portion. And forming a base insulating film on the surface.
- the thickness of the base insulating film is preferably in the range of 5 nm to 60 nm.
- a glass film forming apparatus of the present invention is a glass film forming apparatus for forming a glass film on a surface of a semiconductor wafer having a base insulating film formed on a glass film formation planned surface by electrophoresis.
- a potential applied to the ring electrode plate is applied to the semiconductor wafer disposition jig for disposing the semiconductor wafer, the first electrode plate, the second electrode plate, and the ring electrode plate.
- the first electrode plate than the potential of Such that the potential offset in position side, characterized in that it comprises a power supply for applying a potential.
- a ring electrode plate having an opening having a diameter smaller than the diameter of the semiconductor wafer is installed between the first electrode plate and the second electrode plate, and the ring electrode A semiconductor wafer is arranged between the plate and the second electrode plate, and a glass coating is to be formed in a state where a potential biased to the potential side of the first electrode plate is applied to the ring-shaped electrode plate from the potential of the second electrode plate Since the glass coating is formed on the surface (see FIGS. 3 and 6 to be described later), the flow of the glass particles toward the outside in the radial direction of the semiconductor wafer is observed at the outer peripheral portion of the semiconductor wafer.
- the ring-shaped electrode plate having an opening having a diameter smaller than the diameter of the semiconductor wafer is installed between the first electrode plate and the second electrode plate, A semiconductor wafer is placed between the electrode plate and the second electrode plate, and a glass coating is formed on the ring-shaped electrode plate with a potential biased to the potential side of the first electrode plate relative to the potential of the second electrode plate. Since a glass film can be formed on the planned surface (see FIGS. 3 and 6 described later), the flow of the glass particles toward the radially outer side of the semiconductor wafer is observed at the outer peripheral portion of the semiconductor wafer. It is possible to correct the flow of the glass fine particles toward the glass coating formation planned surface (see the portion indicated by reference character C in FIGS.
- the glass film forming apparatus of the present invention even when a glass film forming process is performed using a semiconductor wafer in which a base insulating film is formed on a glass film forming planned surface as a semiconductor wafer, It is possible to suppress a decrease in the deposition efficiency of the glass fine particles at the outer peripheral portion, and thus it is possible to manufacture a highly reliable semiconductor device with high productivity.
- FIG. 6 is a view for explaining the method for manufacturing the semiconductor device according to the first embodiment.
- FIG. 1A to FIG. 1D are diagrams showing respective steps of the semiconductor device manufacturing method according to the first embodiment.
- FIG. 6 is a view for explaining the method for manufacturing the semiconductor device according to the first embodiment.
- FIG. 2A to FIG. 2D are diagrams showing respective steps of the semiconductor device manufacturing method according to the first embodiment. It is a figure shown in order to demonstrate the glass film formation process in the manufacturing method of the semiconductor device which concerns on Embodiment 1.
- FIG. 3A is a cross-sectional view of the glass film forming apparatus 1 as viewed from the lateral direction
- FIG. 3B is a cross-sectional view of the glass film forming apparatus 1 as viewed from the line AA in FIG.
- FIG. 3 is a view for explaining the structure of a ring-shaped electrode plate 18.
- 4A is a diagram showing the diameter D1 of the semiconductor wafer W
- FIG. 4B is a diagram showing the diameter D2 of the opening of the ring-shaped electrode body 18 and the outer diameter D3 of the ring-shaped electrode body 18.
- FIG. 4C is a diagram showing the diameter D4 of the second electrode plate 16. It is a figure shown in order to demonstrate the flow of the glass microparticles in Comparative Examples 1 and 2 and Embodiment 1.
- FIG. 5A is a diagram showing the flow of glass particles in Comparative Example 1
- FIG. 5B is a diagram showing the flow of glass particles in Comparative Example 2
- FIG. It is a figure which shows the flow of glass particulates.
- FIG. 6 (a) is a cross-sectional view of the glass film forming apparatus 2 as viewed from the lateral direction
- FIG. 6 (b) is a cross-sectional view of the glass film forming apparatus 2 as viewed from the line AA in FIG. 6 (a). is there.
- FIG. 6 is a view for explaining the method for manufacturing the semiconductor device according to the third embodiment.
- FIG. 7A to FIG. 7D are diagrams showing respective steps of the semiconductor device manufacturing method according to the third embodiment.
- FIG. 6 is a view for explaining the method for manufacturing the semiconductor device according to the third embodiment.
- FIG. 8D are views showing respective steps of the semiconductor device manufacturing method according to the third embodiment. It is a figure shown in order to demonstrate the flow of the glass microparticles in Comparative Examples 3 and 4 and Embodiment 3.
- FIG. 9A is a view showing the flow of glass particles in Comparative Example 3
- FIG. 9B is a view showing the flow of glass particles in Comparative Example 4
- FIG. It is a figure which shows the flow of glass particulates. It shows the result of a test example.
- FIG. 10A is a diagram showing the results of Sample 1 (Example)
- FIG. 10B is a diagram showing the results of Sample 2 (Comparative Example). It shows the result of a test example.
- FIG. 11A is a diagram showing the results of Sample 3 (Example), and FIG.
- FIG. 11B is a diagram showing the results of Sample 4 (Comparative Example). It is a figure shown in order to demonstrate the modification of a ring-shaped electrode plate.
- FIG. 12A and FIG. 12B are diagrams showing respective modifications (Modifications 1 and 2). It is a figure shown in order to demonstrate the range of the electric potential V3 given to a ring-shaped electrode plate.
- FIG. 13A is a diagram showing a range of the potential V3 when the potential V1 of the first electrode plate is a negative potential and the potential V2 of the second electrode plate is a positive potential
- FIG. 13B is a diagram of the first electrode.
- FIG. 14 (a) to 14 (d) are diagrams showing each step of the semiconductor device manufacturing method according to Modification 3. It is a figure shown in order to demonstrate the manufacturing method of the conventional semiconductor device.
- FIG. 15A to FIG. 15D are diagrams showing respective steps of a conventional semiconductor device manufacturing method. It is a figure shown in order to demonstrate the manufacturing method of the conventional semiconductor device.
- 16 (a) to 16 (d) are diagrams showing respective steps of a conventional method for manufacturing a semiconductor device.
- FIG. 17A is a cross-sectional view of the glass film forming apparatus 9 as viewed from the lateral direction
- FIG. 17B is a cross-sectional view of the glass film forming apparatus 9 as viewed from the line AA in FIG. 17A. is there.
- the semiconductor device manufacturing method according to the first embodiment includes a “semiconductor wafer preparation step”, a “glass film formation step”, an “oxide film removal step”, and a “roughened region formation step”. ”,“ Electrode formation step ”and“ semiconductor wafer cutting step ”are performed in this order.
- the manufacturing method of the semiconductor device according to the first embodiment will be described in the order of steps.
- a p + type diffusion layer 112 is formed by diffusion of p type impurities from one surface of an n ⁇ type semiconductor wafer (for example, an n ⁇ type silicon wafer having a diameter of 4 inches) 110,
- An n + -type diffusion layer 114 is formed by diffusion of n-type impurities from the other surface to prepare a semiconductor wafer in which a pn junction parallel to the main surface is formed.
- oxide films 116 and 118 are formed on the surfaces of the p + type diffusion layer 112 and the n + type diffusion layer 114 by thermal oxidation (see FIG. 1A).
- a predetermined opening is formed in a predetermined portion of the oxide film 116 by a photoetching method.
- the semiconductor wafer is subsequently etched to form a groove 120 having a depth exceeding the pn junction from one surface of the semiconductor wafer (see FIG. 1B).
- a pn junction exposed portion A is formed on the inner surface of the groove.
- a base insulating film 121 made of a silicon oxide film is formed on the inner surface of the groove 120 by a thermal oxidation method using dry oxygen (DryO 2 ) (see FIG. 1C).
- the thickness of the base insulating film 121 is set in a range of 5 nm to 60 nm (for example, 20 nm).
- the base insulating film 121 is formed by placing the semiconductor wafer in a diffusion furnace and then treating it at a temperature of 900 ° C. for 10 minutes while flowing an oxygen gas. If the thickness of the base insulating film 121 is less than 5 nm, the effect of reducing the BT resistance may not be obtained. On the other hand, if the thickness of the base insulating film 121 exceeds 60 nm, the glass film may not be formed by electrophoresis in the next glass film forming step.
- the electrophoresis method is used in the same manner as in the conventional manufacturing method of the semiconductor device.
- a glass coating 124 is formed on the surface on which the glass coating is to be formed. That is, as shown in FIG. 3, the first electrode plate 14 connected to the minus terminal and the first terminal connected to the plus terminal are placed inside the tank 10 in which the suspension 12 in which the glass particles are suspended in the solvent is stored. The two electrode plates 16 are placed facing each other while being immersed in the suspension 12, and the semiconductor wafer W is formed between the first electrode plate 14 and the second electrode plate 16 on the surface on which the glass film is to be formed (FIG. 3). Then, the glass coating 124 is formed on the surface on which the glass coating is to be formed by electrophoresis in a state where the inner surface of the groove is arranged in a posture facing the first electrode plate 14 side.
- the diameter of the semiconductor wafer W is between the first electrode plate 14 and the second electrode plate 16.
- a ring-shaped electrode plate 18 having an opening with a small diameter is installed, a semiconductor wafer W is disposed between the ring-shaped electrode plate 18 and the second electrode plate 16, and the second electrode plate is disposed on the ring-shaped electrode plate 18.
- a glass film is formed on the glass film formation planned surface in a state where a potential (potential lower than the potential V2 of the second electrode plate 16) biased to the potential V1 side of the first electrode plate 14 from the potential V2 of 16 is applied.
- glass fine particles for example, lead borosilicate glass mainly containing PbO, B 2 O 3 and SiO 2 is used.
- solvent for example, a solution obtained by adding nitric acid to acetone is used.
- a voltage applied between the first electrode plate 14 and the second electrode plate 16 a voltage of 10V to 800V (for example, 400V) is applied.
- the glass film is formed on the surface on which the glass film is to be formed in a state where the same potential as the potential V1 of the first electrode plate 14 is applied to the ring electrode plate 18.
- the opening of the ring-shaped electrode plate 18 has the diameter of the semiconductor wafer W set to D1 (mm) (see FIG. 4A), and the ring-shaped electrode plate 18.
- D2 is a value satisfying the relationship of “D1 (mm) ⁇ 50 mm ⁇ D2 (mm) ⁇ D1 (mm) ⁇ 1 mm” where D2 (mm) is the diameter of the opening of D2 (see FIG. 4B).
- the radial width of the ring electrode plate (the outer diameter D3 of the ring electrode plate 18—the diameter D2 of the opening of the ring electrode plate 18) is set within a range of 5 mm to 15 mm.
- the outer diameter D3 of the ring-shaped electrode plate 18 is set smaller than the diameter D4 of the second electrode plate 16 (see FIG. 4C).
- a glass film forming apparatus having the following configuration, that is, a tank 10 for storing a suspension 12 in which glass fine particles are suspended in a solvent, and a tank in a state of facing each other. 10, the first electrode plate 14 and the second electrode plate 16 installed in the first electrode plate 14, the first electrode plate 14 and the second electrode plate 16, and having a diameter smaller than the diameter of the semiconductor wafer W.
- a ring-shaped electrode plate 18 having an opening, and a semiconductor wafer placement jig (not shown) for placing the semiconductor wafer W at a predetermined position between the ring-shaped electrode plate 18 and the second electrode plate 16.
- the first electrode plate 14, the second electrode plate 16, and the ring-shaped electrode plate 18, and the potential applied to the ring-shaped electrode plate 18 is biased to the potential side of the first electrode plate with respect to the potential of the second electrode plate.
- the semiconductor device (mesa type pn diode) 100 can be manufactured.
- the effects of the method for manufacturing a semiconductor device and the glass film forming apparatus according to the first embodiment will be described with reference to FIG.
- the arrows indicate the flow of glass particles.
- a glass film is formed on the inner surface of the groove of the semiconductor wafer without forming a base insulating film on the inner surface of the groove of the semiconductor wafer (see FIG. 5A).
- a glass film is formed on the base insulating film.
- a glass film is formed without installing a ring-shaped electrode plate (see FIG. 5B).
- the glass film is formed with the ring-shaped electrode plate installed (see FIG. 5C).
- the flow of glass particles toward the outside in the radial direction of the semiconductor wafer W is formed on the outer periphery of the semiconductor wafer W by the action of the ring-shaped electrode plate.
- the flow is corrected to the flow of glass fine particles toward the planned surface (refer to the portion indicated by the symbol C in FIGS. 5B and 5C).
- a glass film is formed on the glass film formation planned surface in a state where a biased potential (potential lower than the potential V2 of the second electrode plate 16) is applied to the potential V1 side of the electrode plate 14 (see FIG. 3).
- the flow of the glass fine particles toward the outside in the radial direction of the semiconductor wafer W can be corrected to the flow of the glass fine particles toward the glass film formation planned surface of the semiconductor wafer W (see FIG. (B) and partial reference shown in FIG. 5 (c) Medium code C.).
- the manufacturing method of the semiconductor device according to the first embodiment as the semiconductor wafer, even when the glass film forming process is performed using the semiconductor wafer in which the base insulating film is formed on the glass film forming scheduled surface, It is possible to suppress a decrease in the deposition efficiency of the glass fine particles in the outer peripheral portion of the semiconductor wafer, and thus it is possible to manufacture a highly reliable semiconductor device with high productivity.
- a glass coating can be formed using a simple power supply device.
- the diameter D2 of the opening of the ring-shaped electrode plate 18 has a relationship of “D1 (mm) ⁇ 50 mm ⁇ D2 (mm) ⁇ D1 (mm) ⁇ 1 mm”. Since the size is set to satisfy the size, the flow of the glass fine particles on the outer peripheral portion of the semiconductor wafer W can be effectively corrected.
- the ring-shaped electrode plate 18 having an opening having a diameter smaller than the diameter of the semiconductor wafer W is installed between the first electrode plate 14 and the second electrode plate 16.
- the semiconductor wafer W is disposed between the ring-shaped electrode plate 18 and the second electrode plate 16, and the potential V 1 of the first electrode plate 14 is higher than the potential V 2 of the second electrode plate 16 on the ring-shaped electrode plate 18.
- a glass film can be formed on the glass film formation planned surface in a state where a potential biased to the side (potential lower than the potential V2 of the second electrode plate 16) is applied (see FIG. 3), the semiconductor.
- the manufacturing method of the semiconductor device according to the second embodiment basically includes the same steps as those of the manufacturing method of the semiconductor device according to the first embodiment, but the contents of the glass film forming step are the same as those of the semiconductor device according to the first embodiment. Different from the manufacturing method. That is, in the method of manufacturing a semiconductor device according to the second embodiment, as shown in FIG. 6, in the glass film forming step, the potential V1 (minus potential) of the first electrode plate 14 and the second potential are applied to the ring electrode plate 18. A glass coating is formed on the glass coating formation planned surface in a state where a potential V3 (for example, a minus potential slightly higher than V1) between the potential V2 (plus potential) of the electrode plate 16 is applied.
- a potential V3 for example, a minus potential slightly higher than V1 between the potential V2 (plus potential) of the electrode plate 16 is applied.
- the manufacturing method of the semiconductor device according to the second embodiment differs from the manufacturing method of the semiconductor device according to the first embodiment in the content of the glass film forming step, but the ring-shaped electrode plate 18 and the second electrode plate.
- the semiconductor wafer W is arranged between the first electrode plate 14 and the ring electrode plate 18, which is biased to the potential V 1 side of the first electrode plate 14 relative to the potential V 2 of the second electrode plate 16 (the potential of the second electrode plate 16. Since the glass film is formed on the glass film formation planned surface in a state where a potential lower than V2 is applied, the glass film formation planned surface as a semiconductor wafer is formed in the same manner as in the semiconductor device manufacturing method according to the first embodiment.
- the ring-shaped electrode plate 18 is applied with the potential V3 between the potential V1 of the first electrode plate 14 and the potential V2 of the second electrode plate 16. Since the glass film is to be formed on the surface on which the glass film is to be formed, the potential V3 applied to the ring electrode plate 18 is controlled to an appropriate voltage, thereby further reducing the deposition efficiency at the outer peripheral portion of the semiconductor wafer. Therefore, a highly reliable semiconductor device can be manufactured with higher productivity.
- the power supply device 20 of the glass film forming apparatus 1 used in the first embodiment is applied to the ring electrode plate 18 with the potential V1 of the first electrode plate 14 and the potential of the second electrode plate 16.
- the glass film forming apparatus 2 (the glass film forming apparatus 2 according to the second embodiment) is used instead of the power supply apparatus 22 that applies an arbitrary potential V3 between V2.
- the manufacturing method of the semiconductor device according to the third embodiment basically includes the same steps as the manufacturing method of the semiconductor device according to the first embodiment. However, unlike the manufacturing method of the semiconductor device according to the first embodiment, A planar pn diode is manufactured as a semiconductor device.
- the semiconductor wafer preparation step includes a step of forming a pn junction exposed portion on the surface of the semiconductor wafer W and a semiconductor so as to cover the pn junction exposed portion. Forming a base insulating film 218 on the surface of the wafer W.
- the semiconductor device manufacturing method according to the third embodiment includes a “semiconductor wafer preparation step”, a “glass film formation step”, an “etching step”, an “electrode formation step”, and a “semiconductor wafer”.
- the “cutting step” is performed in this order.
- the semiconductor device manufacturing method according to the third embodiment will be described below in the order of steps.
- p-type impurities for example, boron ions
- p + type diffusion layer 214 is formed by thermal diffusion (see FIG. 7B).
- a pn junction exposed portion A is formed on the surface of the semiconductor wafer W.
- an n-type impurity for example, arsenic ions
- an n + -type diffusion layer 216 is formed by thermal diffusion (see FIG. 7C).
- the surface of the n ⁇ -type epitaxial layer 212 (and the back surface of the n + -type silicon substrate 210) is made of a silicon oxide film.
- An insulating film 218 is formed (see FIG. 7D).
- the thickness of the base insulating film 218 is in the range of 5 nm to 60 nm (for example, 20 nm).
- the formation of the base insulating film 218 is performed by placing the semiconductor wafer W in a diffusion furnace and then treating it at a temperature of 900 ° C. for 10 minutes while flowing an oxygen gas. If the thickness of the base insulating film 218 is less than 5 nm, the effect of reducing the BT resistance may not be obtained. On the other hand, if the thickness of the base insulating film 218 exceeds 60 nm, it may be impossible to form a glass film by electrophoresis in the next glass layer forming step.
- the glass film 220 is formed on the surface of the base insulating film 218 by electrophoresis as in the case of the first embodiment, and then the glass film 220 is fired.
- the glass coating 220 is densified (see FIG. 8A).
- the semiconductor device (planar type pn diode) 200 can be manufactured as described above.
- the arrows indicate the flow of glass particles.
- a glass film is formed on the inner surface of the groove of the semiconductor wafer without forming a base insulating film on the surface of the semiconductor wafer (see FIG. 9A).
- a glass film is formed on the base insulating film.
- a glass film is formed without installing a ring-shaped electrode plate (see FIG. 9B).
- a glass film is formed with a ring-shaped electrode plate installed (see FIG. 9C).
- the flow of the glass particles flowing at a steep angle toward the radially outer side of the semiconductor wafer W in the outer peripheral portion of the semiconductor wafer W by the action of the ring-shaped electrode plate is corrected to the flow of glass fine particles flowing toward the glass film formation planned surface of the semiconductor wafer W (see the portion indicated by the symbol C in FIGS. 9B and 9C).
- the semiconductor device manufacturing method according to the third embodiment is different from the semiconductor device manufacturing method according to the first embodiment in that a planar pn diode is manufactured as a semiconductor device.
- a semiconductor wafer W is disposed between the electrode plate 18 and the second electrode plate 16, and the potential biased to the ring-shaped electrode plate 18 from the potential V2 of the second electrode plate 16 to the potential V1 side of the first electrode plate 14. Since the glass film is formed on the glass film formation planned surface in a state where (the potential V2 of the second electrode plate 16 is lower), the outer peripheral portion of the semiconductor wafer W is radially outward of the semiconductor wafer W.
- a semiconductor wafer is formed by forming a base insulating film on a surface on which a glass film is to be formed. Even when a glass coating process is performed using a wafer, it is possible to suppress a decrease in the deposition efficiency of glass particles on the outer periphery of the semiconductor wafer, and to manufacture a highly reliable semiconductor device with high productivity. It becomes possible to do.
- the manufacturing method of the semiconductor device according to the fourth embodiment basically includes the same steps as the manufacturing method of the semiconductor device according to the first embodiment, but the composition of the glass fine particles used in the glass film forming step is the same as that of the first embodiment. This is different from the method of manufacturing the semiconductor device. That is, in the method for manufacturing a semiconductor device according to the fourth embodiment, glass particles made of lead-free glass are used as glass particles used in the glass film forming step instead of glass particles made of lead borosilicate glass. Accordingly, a positive potential is applied to the first electrode plate 14, a negative potential is applied to the second electrode plate 16, and the ring-shaped electrode plate 18 has a second potential higher than the potential V 2 of the second electrode plate 16. In a state where a biased potential (potential higher than the potential V2 of the second electrode plate 16) is applied to the potential V1 side of the first electrode plate 14, a glass coating is formed on the glass coating formation planned surface.
- a biased potential potential higher than the potential V2 of the second electrode plate 16
- the manufacturing method of the semiconductor device according to the fourth embodiment is different from the method of manufacturing the semiconductor device according to the first embodiment in the composition of the glass fine particles used in the glass film forming step.
- a semiconductor wafer W is disposed between the second electrode plate 16 and a potential (second electrode) that is biased to the ring-shaped electrode plate 18 from the potential V2 of the second electrode plate 16 to the potential V1 side of the first electrode plate 14. Since a glass film is formed on the glass film formation planned surface in a state where a potential higher than the potential V2 of the plate 16 is applied, as in the case of the semiconductor device manufacturing method according to the first embodiment, a glass is used as a semiconductor wafer.
- the glass coating film is fired by using lead-free glass instead of lead borosilicate glass as the glass fine particles used in the glass coating forming step.
- the generation of bubbles from the interface between the semiconductor wafer and the glass coating is suppressed, and a semiconductor device having a low reverse leakage current can be stably manufactured.
- glass fine particles made of lead-free glass for example, the following glass fine particles, that is, at least SiO 2 , Al 2 O 3 , and B 2 O 3 are used.
- the content of SiO 2 is in the range of 41.1 mol% to 61.1 mol%
- the content of Al 2 O 3 is in the range of 7.4 mol% to 17.4 mol%.
- the content of B 2 O 3 is in the range of 5.8 mol% to 15.8 mol%
- the content of ZnO is in the range of 3.0 mol% to 24.8 mol%
- the alkaline earth metal An oxide having an oxide content in the range of 5.5 mol% to 15.5 mol% and a nickel oxide content in the range of 0.01 mol% to 2.0 mol% can be suitably used. .
- the CaO content is in the range of 2.8 mol% to 7.8 mol%
- the MgO content is in the range of 1.1 mol% to 3.1 mol%
- BaO Those having a content in the range of 1.7 mol% to 4.7 mol% can be suitably used.
- the solvent for example, a mixed solvent of isopropyl alcohol and ethyl acetate to which nitric acid is added is used.
- the glass film forming apparatus 1 used in the first embodiment is used as the glass film forming apparatus when performing the glass film forming step.
- a positive potential is applied to the first electrode plate 14.
- a negative potential is applied to the second electrode plate 16
- a potential (second electrode) that is biased toward the ring electrode plate 18 from the potential V2 of the second electrode plate 16 toward the potential V1 of the first electrode plate 14 is applied.
- a glass coating is formed on the glass coating formation planned surface.
- test example is an example showing the effect of the ring-shaped electrode plate.
- Sample preparation (1) Sample 1 First, the surface of a 4-inch silicon wafer was thermally oxidized to produce a silicon wafer having a 27 nm-thickness base insulating film formed on the surface. Next, basically, a glass film was formed on the base insulating film of the silicon wafer by the same glass film forming process as the glass film forming process described in the first embodiment, and this was used as Sample 1 (Example). .
- Sample 3 A sample was produced in the same manner as in the case of Sample 1 except that the thickness of the base insulating film to be formed was 45 nm, and this was designated as Sample 3 (Example).
- Sample 4 A sample was prepared in the same manner as in the case of Sample 2 except that the thickness of the base insulating film to be formed was 45 nm, and this was used as Sample 4 (Comparative Example).
- FIG. 10 is a diagram showing the evaluation results for Samples 1 and 2.
- FIG. 11 is a diagram showing the evaluation results for samples 3 and 4.
- the symbol B indicates the width of the glass film non-formation region.
- the samples (samples 1 and 3) in which the glass film was formed with the ring electrode plate installed were the samples in which the glass film was formed without installing the ring electrode plate.
- the glass coating non-formation region width B at the outer peripheral portion of the silicon wafer was narrow, and the glass coating was formed up to the vicinity of the outermost periphery of the silicon wafer.
- a ring-shaped electrode plate having a circular outer shape smaller than that of the second electrode plate 16 is used as the ring-shaped electrode plate 18, but the present invention is limited to this. It is not a thing.
- a ring-shaped electrode plate (Modification 1) having a circular outer shape larger than the second electrode plate 16 may be used.
- a ring-shaped electrode plate (Modification 2) having a rectangular outer shape larger than the second electrode plate 16 may be used.
- a negative electrode plate and a positive electrode plate are used as the first electrode plate 14 and the second electrode plate 16, respectively.
- the first electrode plate 14 and the second electrode plate are used.
- a positive electrode plate and a negative electrode plate were used, respectively.
- Which of the first electrode plate and the second electrode plate of the present invention is used as the negative electrode plate or the positive electrode plate depends on the glass fine particles, the solvent, and the added electrolyte. It can be determined appropriately depending on the type and combination.
- a glass film is formed on the ring electrode plate 18 with the same potential as the potential V1 of the first electrode plate 14, and in the second embodiment, the ring electrode plate 18 is formed.
- a glass coating was formed in a state where a potential V3 (a slightly lower potential than V1) between the potential V1 of the first electrode plate 14 and the potential V2 of the second electrode plate 16 was applied to the glass coating film. It is not limited.
- the range of the potential applied to the ring electrode plate 18 is not limited to the range described in the first and second embodiments.
- a predetermined potential biased to the potential V1 side of the first electrode plate 14 relative to the potential V2 for example, a predetermined potential lower than the potential V1 of the first electrode plate 14, the same potential as the potential V1 of the first electrode plate 14,
- a glass coating is applied in a state where a predetermined potential between the potential V1 of the first electrode plate 14 and the potential V2 of the second electrode plate 16 (excluding the same potential as the potential V2 of the second electrode plate 16) is applied. May be formed.
- the second electrode plate is connected to the ring-shaped electrode plate 18 as shown in FIG.
- a predetermined potential biased to the potential V1 side of the first electrode plate 14 from the potential V2 of 16 for example, a predetermined potential higher than the potential V1 of the first electrode plate 14, the same potential as the potential V1 of the first electrode plate 14
- a glass film may be formed.
- Embodiment 3 after the glass coating is formed on the entire surface of the base insulating film formed on the surface of the semiconductor wafer, the glass coating is removed by etching in regions other than the glass coating formation region.
- the present invention is not limited to this.
- a base insulating film 218 is formed on the surface of the semiconductor wafer (see FIGS. 7A to 7D), and further, glass on the surface of the base insulating film 218 is formed.
- a glass film 220 may be formed on the surface of the base insulating film 218 via the mask M4 (Modification 3, FIGS. 14A to 14 ( See d).).
- the semiconductor wafer plate made of silicon is used as the semiconductor wafer, but the present invention is not limited to this.
- a semiconductor wafer made of SiC, GaN, GaO or the like can be used.
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Abstract
Description
まず、n-型半導体ウェーハ(n-型シリコンウェーハ)910の一方の表面からのp型不純物の拡散によりp+型拡散層912を形成するとともに、他方の表面からのn型不純物の拡散によりn+型拡散層914を形成して、主面に平行なpn接合が形成された半導体ウェーハを形成する。その後、熱酸化によりp+型拡散層912及びn+型拡散層914の表面に酸化膜916,918を形成する(図15(a)参照。)。
次に、溝920の表面に、電気泳動法により溝920の内面及びその近傍の半導体ウェーハ表面にガラス被膜924を形成するとともに、当該ガラス被膜924を焼成することにより、ガラス被膜924を緻密化する(図15(c)参照。)。
次に、ガラス被膜924の表面を覆うようにフォトレジスト926を形成した後、当該フォトレジスト926をマスクとして酸化膜916のエッチングを行い、Niめっき電極膜を形成する部位930における酸化膜916を除去する(図15(d)及び図16(a)参照。)。
次に、Niめっき電極膜を形成する部位930における半導体ウェーハ表面の粗面化処理を行い、Niめっき電極と半導体ウェーハとの密着性を高くするための粗面化領域932を形成する(図16(b)参照。)。
次に、半導体ウェーハにNiめっきを行い、粗面化領域932上にアノード電極934を形成するとともに、半導体ウェーハの他方の表面にカソード電極936を形成する(図16(c)参照。)。
次に、ダイシング等により、ガラス被膜924の中央部において半導体ウェーハを切断して半導体ウェーハをチップ化して、メサ型半導体装置(pnダイオード)を作成する(図16(d)参照。)。
実施形態1に係る半導体装置の製造方法は、図1及び図2に示すように、「半導体ウェーハ準備工程」、「ガラス被膜形成工程」、「酸化膜除去工程」、「粗面化領域形成工程」、「電極形成工程」及び「半導体ウェーハ切断工程」をこの順序で実施する。以下、実施形態1に係る半導体装置の製造方法を工程順に説明する。
まず、n-型半導体ウェーハ(例えば直径4インチのn-型シリコンウェーハ)110の一方の表面からのp型不純物の拡散によりp+型拡散層112を形成するとともに、他方の表面からのn型不純物の拡散によりn+型拡散層114を形成して、主面に平行なpn接合が形成された半導体ウェーハを準備する。その後、熱酸化によりp+型拡散層112及びn+型拡散層114の表面に酸化膜116,118を形成する(図1(a)参照。)。
次に、電気泳動法により溝120の内面及びその近傍の半導体ウェーハ表面にガラス被膜124を形成するとともに、当該ガラス被膜124を焼成することにより、当該ガラス被膜124を緻密化する(図1(d)参照。)。
次に、ガラス被膜124の表面を覆うようにフォトレジスト126を形成した後、当該フォトレジスト126をマスクとして酸化膜116のエッチングを行い、Niめっき電極膜を形成する部位130における酸化膜116を除去する(図2(a)参照。)。
次に、Niめっき電極膜を形成する部位130における半導体ウェーハ表面の粗面化処理を行い、Niめっき電極と半導体ウェーハとの密着性を高くするための粗面化領域132を形成する(図2(b)参照。)。
次に、半導体ウェーハにNiめっきを行い、粗面化領域132上にアノード電極134を形成するとともに、半導体ウェーハの他方の表面にカソード電極136を形成する(図2(c)参照。)。
次に、ダイシング等により、ガラス被膜124の中央部において半導体ウェーハを切断して半導体ウェーハをチップ化して、半導体装置(メサ型のpnダイオード)100を製造する(図2(d)参照。)。
実施形態2に係る半導体装置の製造方法は、基本的には実施形態1に係る半導体装置の製造方法と同様の工程を含むが、ガラス被膜形成工程の内容が、実施形態1に係る半導体装置の製造方法の場合と異なる。すなわち、実施形態2に係る半導体装置の製造方法においては、図6に示すように、ガラス被膜形成工程において、リング状電極板18に、第1電極板14の電位V1(マイナス電位)と第2電極板16の電位V2(プラス電位)との間の電位V3(例えば、V1よりも若干高いマイナス電位)を与えた状態でガラス被膜形成予定面にガラス被膜を形成することとしている。
実施形態3に係る半導体装置の製造方法は、基本的には実施形態1に係る半導体装置の製造方法と同様の工程を含むが、実施形態1に係る半導体装置の製造方法の場合とは異なり、半導体装置としてプレーナ型のpnダイオードを製造する。また、これに対応して、図7及び図8に示すように、半導体ウェーハ準備工程が、半導体ウェーハWの表面にpn接合露出部を形成する工程と、当該pn接合露出部を覆うように半導体ウェーハWの表面に下地絶縁膜218を形成する工程とを含む。
まず、n+型半導体ウェーハ210上にn-型エピタキシャル層212が積層された半導体ウェーハを準備する(図7(a)参照。)。
次に、下地絶縁膜218の表面に、電気泳動法により、実施形態1の場合と同様にガラス被膜220を形成し、その後、当該ガラス被膜220を焼成することにより、ガラス被膜220を緻密化する(図8(a)参照。)。
次に、ガラス被膜220の表面にマスクM3を形成した後、ガラス被膜220のエッチングを行い(図8(b)参照。)、引き続き、下地絶縁膜218のエッチングを行う(図8(c)参照。)。これにより、n-型エピタキシャル層212の表面における所定領域に下地絶縁膜218及びガラス被膜220が形成されることとなる。
次に、マスクM3を除去した後、半導体ウェーハの表面におけるガラス被膜220で囲まれた領域にアノード電極222を形成するとともに、半導体ウェーハの裏面にカソード電極224を形成する。
次に、ダイシング等により、半導体ウェーハを切断して半導体ウェーハをチップ化して、半導体装置(プレーナ型のpnダイオード)200を製造する(図8(d)参照。)。
実施形態4に係る半導体装置の製造方法は、基本的には実施形態1に係る半導体装置の製造方法と同様の工程を含むが、ガラス被膜形成工程で用いるガラス微粒子の組成が、実施形態1に係る半導体装置の製造方法の場合と異なる。すなわち、実施形態4に係る半導体装置の製造方法においては、ガラス被膜形成工程で用いるガラス微粒子として、硼珪酸鉛系ガラスからなるガラス微粒子の代わりに鉛フリーガラスからなるガラス微粒子を用いる。また、これに応じて、第1電極板14にプラスの電位を与え、第2電極板16にマイナスの電位を与えるとともに、リング状電極板18に、第2電極板16の電位V2よりも第1電極板14の電位V1側に偏倚した電位(第2電極板16の電位V2よりも高い電位)を与えた状態で、ガラス被膜形成予定面にガラス被膜を形成する。
以下、試験例により本発明をさらに具体的に説明する。
本試験例は、リング状電極板の効果を示す実施例である。
(1)試料1
まず、4インチのシリコンウェーハの表面を熱酸化することにより、表面に膜厚27nmの下地絶縁膜が形成されたシリコンウェーハを作製した。次に、基本的には実施形態1に記載したガラス被膜形成工程と同じガラス被膜形成工程によって、上記シリコンウェーハの下地絶縁膜上にガラス被膜を形成し、これを試料1(実施例)とした。
まず、4インチのシリコンウェーハの表面を熱酸化することにより、表面に膜厚27nmの下地絶縁膜が形成されたシリコンウェーハを作製した。次に、リング状電極板を設置しないこと以外は、試料1の場合と同様のガラス被膜形成工程によって、上記シリコンウェーハの下地絶縁膜上にガラス被膜を形成し、これを試料2(比較例)とした。
形成する下地絶縁膜の膜厚が45nmであること以外は試料1の場合と同様にして試料を作製し、これを試料3(実施例)とした。
形成する下地絶縁膜の膜厚が45nmであること以外は試料2の場合と同様にして試料を作製し、これを試料4(比較例)とした。
各試料(試料1~4)の表面を顕微鏡で観察することによって、シリコンウェーハの外周部においてガラス被膜が形成されていない領域の幅(ガラス被膜非形成領域幅)を測定することにより、リング状電極板の効果を評価した。
図10は、試料1及び2についての評価結果を示す図である。図11は、試料3及び4についての評価結果を示す図である。なお、これらの図中、符号Bはガラス被膜非形成領域幅を示す。
Claims (9)
- ガラス被膜形成予定面に下地絶縁膜が形成された半導体ウェーハを準備する半導体ウェーハ準備工程と、
ガラス微粒子を溶媒に懸濁させた懸濁液を貯留した槽の内部に、第1電極板と第2電極板とを前記懸濁液に浸漬した状態で対向して設置するとともに、前記第1電極板と前記第2電極板との間に前記半導体ウェーハを前記ガラス被膜形成予定面が前記第1電極板側に向いた姿勢で配置した状態で、電気泳動法により前記ガラス被膜形成予定面にガラス被膜を形成するガラス被膜形成工程とを含む半導体装置の製造方法であって、
前記ガラス被膜形成工程においては、前記第1電極板と前記第2電極板との間に前記半導体ウェーハの直径よりも小さな直径の開口を有するリング状電極板を設置するとともに、前記リング状電極板と前記第2電極板との間に前記半導体ウェーハを配置し、前記リング状電極板に前記第2電極板の電位よりも前記第1電極板の電位側に偏倚した電位を与えた状態で前記ガラス被膜形成予定面にガラス被膜を形成することを特徴とする半導体装置の製造方法。 - 前記リング状電極板に前記第1電極板の電位と同じ電位を与えた状態で前記ガラス被膜形成予定面にガラス被膜を形成することを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記リング状電極板に前記第1電極板の電位と前記第2電極板の電位との間の電位を与えた状態で前記ガラス被膜形成予定面にガラス被膜を形成することを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記半導体ウェーハの直径をD1(mm)とし、前記リング状電極板の開口の直径をD2(mm)としたとき、D2を、「D1(mm)-50mm≦D2(mm)≦D1(mm)-1mm」の関係を満たす値に設定することを特徴とする請求項1~3のいずれかに記載の半導体装置の製造方法。
- 前記リング状電極板は、「D1(mm)≦D3(mm)」の関係を満たす直径D3(mm)の仮想円を内包する外形形状を有することを特徴とする請求項4に記載の半導体装置の製造方法。
- 前記半導体ウェーハ準備工程は、
主面に平行なpn接合を備える半導体ウェーハを準備する工程と、
前記半導体ウェーハの一方の表面から前記pn接合を超える深さの溝を形成することにより、前記溝の内面に前記pn接合露出部を形成する工程と、
前記pn接合露出部を覆うように前記溝の内面に前記下地絶縁膜を形成する工程とを含むことを特徴とする請求項1~5のいずれかに記載の半導体装置の製造方法。 - 前記半導体ウェーハ準備工程は、
半導体ウェーハの表面に前記pn接合露出部を形成する工程と、
前記pn接合露出部を覆うように前記半導体ウェーハの表面に前記下地絶縁膜を形成する工程とを含むことを特徴とする請求項1~5のいずれかに記載の半導体装置の製造方法。 - 前記下地絶縁膜の膜厚は、5nm~60nmの範囲内にあることを特徴とする請求項1~7のいずれかに記載の半導体装置の製造方法。
- ガラス被膜形成予定面に下地絶縁膜が形成された半導体ウェーハの表面に電気泳動法によりガラス被膜を形成するためのガラス被膜形成装置であって、
ガラス微粒子を溶媒に懸濁させた懸濁液を貯留するための槽と、
互いに対向した状態で前記槽の中に設置された第1電極板及び第2電極板と、
前記第1電極板と前記第2電極板との間に設置され、かつ、前記半導体ウェーハの直径よりも小さな直径の開口を有するリング状電極板と、
前記リング状電極板と前記第2電極板との間の所定位置に半導体ウェーハを配設するための半導体ウェーハ配設治具と、
前記第1電極板、前記第2電極板及び前記リング状電極板に、前記リング状電極板に印加する電位が前記第2電極板の電位よりも前記第1電極板の電位側に偏倚した電位となるような、電位を与える電源装置とを備えることを特徴とするガラス被膜形成装置。
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DE112014005031B4 (de) | 2019-04-25 |
CN105981141B (zh) | 2018-09-18 |
US9978882B2 (en) | 2018-05-22 |
JP6029771B2 (ja) | 2016-11-24 |
TWI584381B (zh) | 2017-05-21 |
JPWO2016075787A1 (ja) | 2017-04-27 |
KR20160075562A (ko) | 2016-06-29 |
US20160322512A1 (en) | 2016-11-03 |
TW201622010A (zh) | 2016-06-16 |
DE112014005031T5 (de) | 2016-08-11 |
CN105981141A (zh) | 2016-09-28 |
KR101851884B1 (ko) | 2018-04-24 |
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